Improvement in propellers



N. PETERS, PMOYO-UTHOGRAPHER, WAS

' `CHRISTIAN SHARP-s, or PHILADELPHIA, PENNSYLVANIA.

Lette/Armut No. 95,150, dem september 21,1869.

*Mov- I MPRvzIMENT IN PR'QPELLERS.

Thesciledule referred t'o theve Letters Patent `and making part of the same.

lTo all wle-omi it may couvent- Beit known that I, CHRISTIAN SHARPs, of Phila .delphia, Pennsylvania, have invented cert-ain Improvements in Propellers.; and 'I do hereby=declare the following to be'a full, clear, and exact description of the same. "My invention relates, for the most-part,toimprovef ments in propeller-s and vessels, for which Letters l. I Pa-tent were granterltome on the 25th day Aof May, 1869, my'present improvements consisting of a device,

. described hereafter,for resisting :the strain-to which*v the .inclined shaft,.described in the said patent, is subjected; also, of fa peculiar manner, described hereafter, of constructing propellers, with a View to lightness and economy.

l l In order to enable others skilledin the art to-make and apply my invention, I will nowproceed to describe its construction and operation, reference being had to the accompanying drawing, which forms apart of this specitcation, andin which- Figure-1 is a plan view of the stern of a steam ves-l sel, with `my improvement.

Figure 2, an end, view of `the propeller, partly in sect-ion. I

The shaft .A `oi' the propeller is inclined, asV in my" former patent, and there is 'in the decky an inclined opening, a., for receivingtbe propeller.

To the `shaft A is `securedthe hollowhub B, ofeastiron, which,in thelpresent' instance, is made six-sided, 'to correspond with thejnumber of, the blades. On each of these six sides is cast a .projection orflange, b, so inclined as to correspond with the desired inclina- `tion oi the blades. These flanges are also made hollow, for the sake of lightness. 4 Each .blade D consists of three plates, d, e, and f,

p j of sbeetiron, the plate projecting a short distance between the plates e and f, and the whole being secured together at h, while the plates e andV f diverge at this point toward the hub B, whereone of the inclined yflanges fits betweenthem, the plates being prop.- erly `secured to the` hub' by bolts or rivets.

o By this arrangement, a large and light blade mayr be made di' comparatively small lpieces of sheet-iron, while sufficient 'rigidity is secured by the diverging plates e and f, which mayT he secured together'by cross-stays,-at suitable intervals. v

Owing to the peculiar inclined posit-ione? the'shaft A,'in respect to the direction in which the blades act on the-water, there must be a constant strain on the shaft, in the direction of the arrow, iig. 1, and consequentlya great pressure of the shaft against its bearings t t'. In order toresist this strain, I secure to the edge j of the inclined opening a, in the declnabracket,

E, carrynga roller, k, against the periphery of which the bevelled front end of thev hub bears, shown in iig. l I

I claim as .my invention, andl desire to sec-ure 'by Letters Patent- 1. In combination with an inclined propeller-shaft` A, a roller, k, for resisting the strain imparted to the said shaft, as set forth. l

2. A blade, D, composed of three plates,fconuected gogether, and secured to a yflange on the` hub, as, set

orth. L`

3. The hollow hub-B, with its hollow projections 11.

In' testimony whereof', I have signed my name to this specification, in the presence of two subscribing witnesses.

` CHRISTIAN SHARPS.

Witnesses:

JOHN WHITE,

WN'I. it. D ELANY. 

